<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
  <h1>修改商品页面</h1>
  <input type="text" v-model="product.id">
  <input type="text" v-model="product.title">
  <input type="text" v-model="product.price">
  <input type="text" v-model="product.num">
  <input type="button" value="修改商品" @click="update()">
</div>
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
<script>
    let v = new Vue({
        el:"body>div",
        data:{
          product:{
            id:"1",
            title:"电脑",
            price:"5600",
            num:"12"
          }

        },
        methods:{
          update() {
              //发出异步修改请求
              axios.post("/update", v.product).then(function (response) {
                  alert("修改完成!");
                  location.href = "/list.html";//返回列表页面

              })
          }
        },

        created:function (){
            //发请求获取修改商品的信息
            //location.search得到?以及参数 ?id=3
            axios.get("/selectById"+location.search).then(function (response) {
              //服务器响应的是一个商品对象的信息
              v.product = response.data;

            })
        }

    })
</script>
</body>
</html>